Express.js | app.post() Function

The app.post() function routes the HTTP POST requests to the specified path with the specified callback functions.

Syntax:

app.post(path, callback [, callback ...])

Arguments:

1. Path: The path for which the middleware function is invoked and can be any of:
   • A string representing a path.
   • A path pattern.
   • A regular expression pattern to match paths.
   • An array of combinations of any of the above.
2. Callback: Callback functions can be:
   • A middleware function.
   • A series of middleware functions (separated by commas).
   • An array of middleware functions.
   • A combination of all of the above.

Installation of express module:

1. You can visit the link to Install express module. You can install this package by using this command.

   npm install express

2. After installing express module, you can check your express version in command prompt using the command.

   npm version express

3. After that, you can just create a folder and add a file for example, index.js. To run this file you need to run the following command.

   node index.js

Filename: index.js

var express = require('express');
var app = express();
var PORT = 3000;

app.post('/', (req, res) => {
  res.send("POST Request Called")
})

app.listen(PORT, function(err){
    if (err) console.log(err);
    console.log("Server listening on PORT", PORT);
});

Steps to run the program:

1. The project structure will look like this:
   
2. Make sure you have installed express module using following command:

   npm install express

3. Run index.js file using below command:

   node index.js

   Output:

   Server listening on PORT 3000
   

4. Now make POST request to http://localhost:3000/ and you will get the following output:

   POST Request Called

So this is how you can use the express app.post() function which routes HTTP POST requests to the specified path with the specified callback functions.

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